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Old 16th August 2003, 10:50 AM   #21
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Default 275W/4R


Thanks for the schematics! Have you tried the one with the opamp input? I would like an amp with opamp input so that I can experiment (and learn hopefully) with different opamps.

I also found an amp at Jan's site called Lynx amp. His site is found at:

I have to ask permission first though.

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Old 16th August 2003, 11:25 AM   #22
sajti is online now sajti  Hungary
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Now I have another project. I want to build some simple amplifier to test my PA speaker systems. So I want to redesign the 310W amplifier's output stage with opamp drive. As I checked it's possible without lot of modification....

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Old 16th August 2003, 06:31 PM   #23
Electrons are yellow and more is better!
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Default Re: Hi again!

Originally posted by JojoD818
What is C16 and C17 for? It seems to be placed across the wrong pins of the tip31/32???

In the schematic it is placed across the collector and emitter. However in the pcb it is placed across the base and collector

Which one is correct? The schematic or the pcb design?
Those caps seem Why do you want to add capacitance? I thought you should avoid it, extra capacitance? Can anyone give me a good explanation which I can believe in?
/Per-Anders (my first name) or P-A as my friends call me
PA03 LM4780 amplifier group buy, SIGN UP HERE for the group buy 0 boards left. 110 paid.
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Old 18th August 2003, 11:15 AM   #24
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Just a short warning to JoJo (and others)

Schematics on the LYNX Power Amplifier HAS NOT BEEN UPDATED yet. It will hopefully be done within this week....
Free Schematic and Service Manual downloads, Spare time company (just for fun):
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Old 18th August 2003, 08:33 PM   #25
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Thanks for the info about the Lynx update. Waiting...

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Old 19th August 2003, 06:39 AM   #26
AJT is offline AJT  Philippines
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Default leach is it

after building a leach super amp, i have no more eyes for other amp topologies!!!! it's like finding your one true love!!! cheers!!
the best advertisement for a good audio design is the number of diy'ers wanting to build it after all the years....never the say so of so called gurus....
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Old 19th August 2003, 12:32 PM   #27
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Default endless choices


Hi! I have already finished my leach amp 2 weeks ago and is still playing. I love this amp, it's quiet, powerful and sounds very good. But best of all, I built it!

On the case of other amps, I believe that for me to increase my knowledge/experience in electronics, I must expose mysef to it. Building my leach amp taught me a lot, but now it's finished. I can't keep my hands from doing eletronics so what better way to spend my free time? Yup, you got it - build other amps.

If you have other amp projects, can you post them?

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